Sierra Madre del Sur

These are big mountains in southern Mexico. They sit near the Pacific sea. The mountains go from west to east.

Some parts are very high. One peak is called Cerro Nube. It is in a place called Oaxaca.

Many green trees grow here. Some trees lose their leaves in the dry season. This happens because it is dry.

Many kinds of animals live in the woods. The mountains have many special plants too. It is a busy place for life.

New roads help people cross the hills. You can see many beautiful views there.

The Sierra Madre del Sur is a mountain range. It sits in southern Mexico. These mountains run from Michoacán to Oaxaca. They sit near the Pacific coast. The range goes east and west for about 180 km.

Some parts of the mountains are very high. Many areas sit over 1,500 metres up. The highest point is Cerro Nube. It is in southern Oaxaca. The mountains meet other ranges in the north. A river valley keeps them apart in the west.

Life is very busy in these mountains. Many plants and animals live here. Some are endemic. This means they live in no other place. High up, you will find pine and oak forests. Lower down, you will see tropical dry forests. In these forests, many trees lose their leaves. They do this during the dry winter.

Traveling through the mountains can be hard. For a long time, only one big road existed. Now, two major highways help people travel through Oaxaca. There are also many protected areas. These places help keep the plants and animals safe.

The Sierra Madre del Sur is a large mountain range. It sits in southern Mexico. These mountains stretch from Michoacán in the west to Oaxaca in the east. They run near the Pacific coast. The range goes east and west for about 180 km. It is a very important part of the land.

The mountains have many different parts. In the north, they meet the Trans-Mexican Volcanic Belt. However, a river valley separates them further west. The Balsas River and the Tepalcatepec River create this gap. The mountains of Michoacán are near Coalcomán. Most people consider them part of this range. The eastern end is called the Sierra Miahuatlán.

Nature is very busy in these mountains. The range has a high amount of biodiversity. This means many different living things live there. Many species are endemic. This means they live in no other place on Earth. High up, you will find pine-oak forests. These forests are part of a long chain of forests. They stretch from the United States to Costa Rica.

Different heights have different plants. The higher areas have pine and oak trees. The lower areas have tropical dry forests. These forests include woodlands and thorn scrub. Many trees lose their leaves in the winter. This happens during the dry season. The Jalisco dry forests are at the western end. The Southern Pacific dry forests cover much of the Pacific slope.

People work to keep these mountains safe. There are many protected areas. These include the Sierra de Manantlán and the Tehuacán-Cuicatlán biosphere reserves. Other places like Omiltemi Ecological State Park help too. Traveling here has changed recently. Until 2024, only one major highway crossed the range. Now, two major highways in Oaxaca are open.

The Sierra Madre del Sur is a major mountain range located in southern Mexico. It stretches across several important states in the region. The range begins in southern Michoacán and moves east through Guerrero. It continues until it reaches the Isthmus of Tehuantepec in eastern Oaxaca. This range is a vital part of the North American Cordillera. It runs parallel to the Pacific coast for about 180 km. The mountains are characterized by high elevations and diverse landscapes. Many areas sit at heights over 1,500 metres.

The geography of the range is shaped by several large landforms. In northern Oaxaca, the Sierra Madre del Sur joins the Eje Volcánico Transversal. This is also known as the Trans-Mexican Volcanic Belt. However, the two ranges are separated further to the west. The valley of the Balsas River creates this gap. The Tepalcatepec River, a tributary, also helps define this separation. Although the deep canyon of the lower Río Balsas divides them, the mountains near Coalcomán in southern Michoacán are usually included as part of the range. The eastern section of the mountains has its own name: the Sierra Miahuatlán.

Different sections of the mountains support very different environments. The highest point in the entire range is Cerro Nube. It is located in southern Oaxaca. The eastern and northeastern sides are bounded by the Tehuantepec River valley. To the north, the range is bordered by the Central Valleys of Oaxaca. The Pacific slope of the Sierra Miahuatlán is unique for its humid broadleaf forests. These forests thrive due to the moisture and specific terrain of the slope.

Ecology in the Sierra Madre del Sur is defined by high biodiversity. This means the area contains a huge variety of living things. Many of these are endemic species. An endemic species is one that lives in only one specific place on Earth. The higher reaches of the mountains contain the Sierra Madre del Sur pine-oak forests ecoregion. This ecoregion is part of a much larger chain of Mesoamerican pine-oak forests. This massive forest system stretches from the Southwestern United States all the way to Costa Rica.

As you move to lower elevations, the environment changes significantly. The lower parts of the range are covered by tropical dry forests. These forests are made of closed-canopy forests, woodlands, and thorn scrub. In these areas, many trees and shrubs lose their leaves during the winter dry season. Different types of dry forests exist in specific locations. The Jalisco dry forests occupy the western end of the Pacific slope. The Southern Pacific dry forests cover most of the Pacific slope from Michoacán through Guerrero and Oaxaca. Additionally, the Balsas dry forests live in the river basin north of the mountains.

Conservation is a major focus for protecting this diverse landscape. There are many official protected areas throughout the range. These include the Sierra de Manantlán and the Zicuirán-Infiernillo biosphere reserves. The Tehuacán-Cuicatlán biosphere reserve is another important area. Other protected spots include General Juan Álvarez National Park and Omiltemi Ecological State Park. There are also several voluntary conservation areas. These include places like Cerro Azul, El Corozal, and El Borbollón. These efforts help safeguard the many endemic species found in the mountains.

Human connection to the range has changed due to new infrastructure. For a long time, traveling through the mountains was difficult. Until 2024, only one major highway crossed the range between Acapulco and Mexico City. This made movement between these locations limited. However, two major highways were inaugurated in the state of Oaxaca in 2024. These new roads change how people access the mountains. They connect the different regions of the Sierra Madre del Sur more easily than ever before.